Flavor



United States Patent FLAVOR Irving I. Rusolf, Park Ridge, N.J., assignor to General Foods Corporation, White Plains, N.Y., a corporation of Delaware No Drawing. Application March 6, 1958 Serial No. 719,476

15 Claims. (Cl. 99-140) and is thus a continuation-in-part of that co-pending application.

Flavor derived from cacao for manufacture ofchocolate and cocoa products involves numerous widely separated and distinct steps commencing atthe plantations in tropical environs and continuing until incorporation of the flavor in a finished product which can be a confectionery, beverage, or like food product. From the time cacao seeds are removed from their pods and are subjected to well-known processes which include fermentation, drying, grading, etc., obscure chemical reactions take place that condition the beans for roasting, during which the characteristic flavor of chocolate is developed. While progress has been made in the art of developing natural chocolate flavor, the processes involved require a high degree of control and are widely separated, the flavor varies with the source of the cacao, and the cost is excessive.

The invention has for its primary object the elimination of reliance on cacao as the sole source of chocolate flavor by development of such flavor from a wide variety of other raw materials.

It has been discovered that partially hydrolyzed egg albumin can be reacted with reducing sugars and precursors thereof to provide an imitation or artificial chocolate flavor component which may be used as the base flavor factor. By .base flavor factor is meant a flavor component which may be used in combination with bitterness, astringency and otherflavor factors to provide an imitation. or artificial chocolate flavor. The base flavor factor may also be employed to enhance the flavor of natural chocolate products. The base flavor factor provides fullness and body which levels out and prolongs the taste sensation.

The reaction to develop the above-described base flavor factor is carried out by the application of heat to a mixture of the reagents at a temperature and for a time sufficient to produce the base flavor factor in a substantially anhydrous condition as least at the end of the reaction. The reaction is carried out at a temperature of 90-l30 C. where the saccharide is a pentose; 120-150 C. where the saccharide is selected from the group of hexoses and reducing polysaccharides; and l40l70 C. Where the saccharide is a non-reducing polysaccharide which is a precursor of a reducing saccharide, the time for such reaction varying inversely with temperature. Any one of a number of well known apparatus may be employed to carry out the reaction such as a spraydrier, a pan roaster,

ble amino nitrogen and reducing sugars in the reaction mixture.

The egg albumin degradation technique employed herein to produce the partially hydrolyzed protein may be enzymatic, acidic, or alkaline, although it is preferred for the purpose of the present process that enzymatic or acidic hydrolysis be utilized. Of these egg albumin hydrolysis methods that which is more preferred is the one employing enzymes. Such enzymes include the proteolytic enzymes such as trypsin, rennin, pepsin, erepsin, papain, bromolin, and the like. The use of alkaline degradation of the protein frequently results in the development of undesirable off-flavors in the final product, the artificial base flavor factor. Both alkaline and acid degradation are more diflicult to control as compared with the enzyme degradation, require expensive, corrosion-proof equipment and, moreover, in some cases destroy certain amino acids which as set forth hereinafter are desired from the standpoint of obtaining best results. The degree of drolysis or proteolysis required in the present invention is substantially between 8% and 70%, viz., 840% of the total nitrogen in the hydrolyzate is amino nitrogen. Generally, it has been found that as the degree of proteolysis increases, the flavor intensity of the base flavor factor also increases.

It is believed that the degree of egg albumin hydrolysis employed as described above is such that the peptides in the protein hydrolyzates are di-, tri-, and the somewhat more complex peptides which can best be described as oligopeptides. The term oligopeptides is employed herein to denote di, tri-, and up to pentaand hexapeptides. It has been found that substantially unhydrolyzed proteins on the one" hand and amino acids on the other hand are incapable of reaction with the reducing sugars to provide the base flavor factor and that partially hydrolyzed protein 1' is essential to provide said factor; best results are obtained with oligopeptides. However, some amino acids such as alpha-amino-n-butyric acid, histidine, alanine, arginine,

aspartic acid, glycine, glutamic acid, valine, phenylalanine, proline, lysine, iso-leucine, leucine, threonine, tyresine,

and tryptophane, when present at the time of reacting the mean the percent of total nitrogen which is amino nitrogen, the former being determined by the Kjeldahl method and the latter being determined by the formol method.

In the work described herein, amino nitrogen was determined by the method described in David M. Greenbergs Amino Acids and Proteins, Charles: C. Thomas, Springfield, Illinois (1951), on pages 80, 81 and 246. Another formol titration method is that developed by Sorenson and described in the Oflicial Methods of Analysis of the Association of Oflicial Agricultural Chemists,

7th ed., A.O.A.C., Washington, DC. (1950), on page 365. Generally, in the case of pure proteins, formol nitrogen determination by the Greenberg method can be converted to Sorenson values by multiplying the Greenberg values by the factor 0.56. With proteins in a highly buflered system such as cows milk, this conversion factor 3.

2,887,384 latented n t-ty 1 9.

particularly preasamsea.

cannot be employed because values provided by the two different methods of analysis do not differ proportionately as they do with pure protein.

. The egg albumin hydrolyzate may berea'cted withany suitable reducing saccharide, that is, a saccharide capable of reducing Fehlings solution to give cupro'us oxide, or with any suitable precursor thereof, which expression ineludes all saccharides and other materials that provide a reducing saccharide or saccharides under the conditions of thereaction. T hese'precursor materials consist mainly ofthose diand poly-saccharides which undergo molecular cleavage to yield reducing saccharides, such. as the disaccharide, sucrose; the trisaccharide, raffinose; the polysaccharide material, dextrin, which of itself comprisesboth reducing saccharides and precursors thereof; etc. The reducing saccharides include all monosaccharides, disaccharides of the gentiobiose type, the trisaccha ride manninotriose, etc. In addition, certain saccharic materials can be used which are derived from or closely related t'o the monosaccharides and have similar reducing properties, suchas the -uronic acid, galacturonic acid; the desoxy sugar, rhamnose; and the pentaacetate of galactose. Thus the term reducing saccharide as used in the claims will be understood to include all of the reducing saccharide and saccharic compounds and pre-- cursors which provide reducing saccharide or saccharic compounds under the conditions of the reaction by degradation of the molecule or in any other manner.

Generally, the reducing sugar and the egg albumin hydrolyzate may be reacted in widely varying proportions by weight. The amount of reducing sugar may range, for example, from -150% by weight of the protein hydrolyzate and excellent results will be obtained. In the case of monosaccharides like glucose, base flavor factor is obtained in the range of 5-20% glucose by weight of eggalbuminhydrolyzed to 50%, optimum flavor being derived at levels of glucose between 5-15 The temperature and time of reaction depend on the nature of the reactants, particularly the s'accharide. For example, the greater reactivity of the monosaccharides make possible the use of lower temperatures without requiring excessiveheating periods, whereas, in the case of less reactive disaccharides it is desirable to employ higher temperatures.

I The useful saccharide materials can be divided into the following groups according to the preferred temperature ranges of the reaction, although it will be understood that the stated limits of these preferred ranges are not necessarily the minimum or maximum temperatures at which some useful results can be secured.

(1) The pentoses, including aldopentoses, methyl pentoses', ketopentoses, etc. Examples are xylose, arabinose and rhamnose. For this group, the preferred temperature range of the reaction isfrom 90 C. to about 130 C.

I (2) The hexoses and reducing polysaccharides. In common with the pentoses of group 1, these reducing saccharides of group 2 have reactive aldehyde or ketone groups which are free to participate directly in the reaction with the protein hydrolyzates, but are less reactive than the pentoses so that the preferred temperature range for the reaction is approximately from 120 C. to 150 C. Examples are the aldohexoses such as glucose, galactose and mannose; the ketohexoses such as levulose and sorbose; reducing disaccharides such as lactose and maltose and other disaccharides of the gentiobiose type; the reducingtrisaccharide manninotriose; etc. With this group may also be classified saccharide mixtures such as corn syrup and malt syrup which contain both dextrose and maltose, and invert sugar which contains dextrose and levulose. In addition, such saccharic materials as galacturonic acid and the pentaacetate of galactose can be used in this temperature range.

(3) Non-reducing polysaccharides which are precursors of reducing saccharides, as explained above. In this group, the temperature must be high enough in the first place to cause the formation of the reducing saccharide, and the preferred temperature range is approximately C. to C. Examples are the polysaccharides sucrose, dextrin and rafiinose.

As indicated above, the reagents are heated at a temperature and for a time sufficient to create a substantially anhydrous condition at least at the end of the reaction. It appears that the properly mixed reactants require removal of. suificient quantities. of water to provide a substantially anhydrous somewhat molten mixture for roasting to develop the artificial chocolate flavor of the present invention. However, the term substantially anhydrous is not meant to exclude the presence of some water in solution. In fact, a small amount of water is formed continuously during the course of the reaction, which fact alone is suflicient to preclude a completely anhydrous molten state at the end of the reaction. No analytical methods are" available which permit determining with accuracy the maximum amount. of water permissible at the endv ofv the reaction. Good results have been obtained when the end product at the reaction temperature contained suflicient moisture to render it more or less tacky in nature, and I believe that as much as 5-10% moisture may have been present in some of such cases. These figures cannot be determined definitely, however, and in practice it is satisfactory to observe the rule that the product upon cooling to room temperature is substantially solid and substantially dry to the touch. The term substantially anhydrous" is to be understood to include the presence of moisture within this limitation.

As aforementioned, the base flavor factor of the present invention can be combined with various other flavor factors of chocolate such as. bitterness, astringency, aroma, and like factors. in the. preparation of an. artificial chocolate flavor. The bitterness, astringency, aroma, and like factors, whether: employed alone or in comb1nation, fail. to provide an artificial chocolate flavor but when one or more of these factorsv is combined with the base flavor factor of the present invention the taste sensation is leveled off and prolonged because of the fullness and body provided by the base flavor factor. The base flavor factor can be regarded as a background against which the more distinctive flavor factors such as bitterness, astringency, aroma and the like can be better appreciated.

Bitterness may be provided by the addition of bitter alkaloids such as caffein, theobromine, quinine, and the like. Other bitterness flavor factors that may be employed are the bitter polyacetates of polyhydric compounds such as the monosaccharides, glucose and levulose; the di saccharides, sucrose, lactose and maltose; the polyhydric alcohols, such as sorbitol and mannitol. Included in this class of bitterness factors are sucrose octaacetates, glucose triacetate, glucose tetraacetate, glucose pentaacetate, levulose triacetate, levulose tetraacetate, levulose pentaacetate, maltose octaacetate, sorbitol hexaacetate. Generally, the beta isomer of the polyacetates is much more bitter than the alpha isomer. Another class of bitterness flavor factors which may be employed are the bitter glucosides, such as quassin, naringin, the alpha-phenol-glucoside, beta-phenol-glucoside, 2,3,5,6-tetra-acetyl-alphaphenol-glucoside, 2,3,5,6-tetra-acetyl-beta-phenol-glucoside, 2,3,5,6-tetra-acetyl-alpha-methyl-glucoside, 2,3,5,6 tetra-acetyl-beta-methyl-glucoside. Still another group of bitterness flavor factors are the bitter acetonylated sugars such as diacetone-glucose, 3-acetyl-diacetone-glucose, 3- acetyl-monoacetone-glucose, 3-benzoyl-diacetone-glucose, and 6-benzoyl-monoacetone-glucose. Still another class of bitter flavor factors are salts and esters of inorganic acids such as dulcitol pentanitrate, potassium sulfate, isoamyl potassium sulfate, methyl-hexylcarbinol potassium sulfate.

Astringencymay be provided by employing various tannins or tannates obtained by infusion or evaporation from wood, leaves or fruit of plants, e.g., extracts of the heartwood ofacacias such as Acacia catechu and Acacia catechu su'ndra which are broadly referred to in the trade as cutchf and the galls of oak, sumac, etc. Such astringency factors are generally water-soluble and include catechin having the formula C H O Included inthis class of compounds are dl-catechol, d-catechol and d-epicatechol. Among some of the useful commercially available astringency factors are various powdered products such as cocoa tannins, catechu gum, gambir gum, rhatany root, eyebright herb, white oak bark, witch hazel bark, quebracho wood extract, chestnut leaves, red oak bark, black kino gum and gum myrrh. Other astringent materials include the alums such as sodium, potassium, ammonium, and like alums.

Chocolate aroma materials that can be employed in combination with the base flavor factor of the present invention, preferably along with the bitterness and astringency flavor factors described above, include aromatic materials derived from chocolate liquor, cocoa' beans, cocoa powder by distillation, solvent extraction, and the like. In order to have a completely artificial chocolate flavor, however, one may employ a mixture of oil of coriander, vanillin, ethyl vanillin, oil of nutmeg,

cinnamon and other essential oils which provide an aromatic principle similar to that of natural chocolate.

The base flavor factor resulting from the process of the invention is usually a powdery, friable material which is soluble in aqueous medium such as water, milk, and the like. The product is capable of incorporation into a number of food products, either as the base flavor factor in an artificial chlocolate flavor or to enhance the flavor of natural chocolate. The base flavor factor of the present invention alone or with other flavor factors of chocolate can be included in a wide variety of confectionery prod ucts such as chocolate bars, candy coatings, cocoa powders for milk drinks and baked goods. Advantageously, the product may be combined with fats such as cocoa butter or with other fats and oils.

The term egg albumin is used to include all the various proteins found in the eggs of fowl, mammals, reptiles, fishes, molluscs, crustaceans, insects, and the like. Among the proteins which this term is intended to include are ovalbumin, ovomucoid, ovomucin, ovocanalbumin, ovoglobulin, ovovitellin, and ovolivetin.

The following example illustrates an embodiment of the invention, but it is to be understood that this example is for purposes of illustration and that the invention is not limited thereto, since various changes can be made by those skilled in the art without departing from its scope and spirit.

The following compositions can be thoroughly mixed in a 50 cc. beaker:

To the above mixture of ingredients 30% water was added until a pasty consistency was obtained. The mixture was then heated for 8 minutes at approximately 130 C. in an oil bath and yielded a dark brown, water-soluble, friable substantially anhydrous mass. 0.5 gm. of the powdered product was dissolved in 100 ml. of whole milk containing 5 gms. of sucrose to provide a chocolate flavored milk drink. Alternatively, the egg albumin hydrolyzate and the reducing sugars arabinose, glucose and fructose may be reacted in the oil bath to provide the base flavor factor, the tannins, theobromine and the caffein being added after the reaction to provide the desired artificial chocolate flavor.

The base flavor factor of the present invention may be employedjin the enhancement of natural chocolate prod-, ucts such as coatings using, for example, the following; procedure. 32 lbs. of chocolate liquor, 15 lbs. of cocoa butter, 45 lbs. of coating sugar, 3.5 lbs. of skim milk pow der, and 2 lbs. of the base flavor factor of the present invention as provided, for example, by the process of above, are mixed in a regular chocolate blender heated at a temperature of 120 F., said mixing requiring about 20 minutes. Onthe other hand, a melangeur may be em ployed in place of the aforementioned blender. The blended material is then ground in a S-roll grinder or refiner, and the liquor is then conched for about 36 hours after which additional cocoa butter is added to reduce viscosityif desired.

Another unique advantage of the present invention is that the reaction to develop the base flavor factor may be carried out using reagents which are found in egg. Thus, the base flavor factor can be obtained from a single raw material by hydrolyzing the egg albumin protein (with acid or enzym the saccharide is present in theegg as glucose; the digest can then be reacted at an elevated temperature, preferably between 120-150 C., and the base flavor factor developed in this manner presents a convenience of operation which offers a substantial economic saving, when large quantities of the base flavor factor are being prepared. However, if it is so desired, the base flavor factor may be prepared by combining the hydrolyzate of the protein with the isolated saccharide.

It will be understood that while the invention has been described in part by means of specific examples, reference should be had to the appended claims for a definition of the scope of the invention.

What is claimed is:

1. A process for producing a chocolate base flavor factor comprising reacting a partially hydrolyzed egg albumin with a saccharide by the application of heat to a mixture of the reagents at a temperature and for a time suflicient to produce said base flavor factor in a substantially anhydrous condition at least at the end of the reaction, the reaction being carried out at a temperature of -l30 C. where the saccharide is a pentose; -l50 C. where the saccharide is selected from the group of hexoses and reducing polysaccharides; and 170 C. where the saccharide is a non-reducing polysaccharide which is a precursor of a reducing saccharide.

2. The process of claim 1 in which the protein is hydrolyzed to 8-70% 3. The process of claim 1 in which the reducing saccharide is a pentose and the reaction is carried out at a temperature within the range of 90-130 C.

4. The process of claim 1 in which the reducing saccharide is a polysaccharide and the reaction is carried out at a temperature within the range of 120-150 C.

5. The process of claim 1 in which the reducing saccharide is a non-reducing polysaccharide which is a precursor of a reducing saccharide formed under the conditions of the reaction and the reaction is carried out at a temperature within the range of l40-170 C.

6. The process of claim 1 in which the reducing sugar is glucose.

7. An artificial chocolate flavor which comprises in combination the base flavor factor of claim 1 and a bitterness flavor factor.

8. A cacao material of enhanced chocolate flavor which comprises in combination the base flavor factor of claim 1 and chocolate liquor.

9. An artificial chocolate flavor which comprises in combination the base flavor factor of claim 1 and a bitter polyacetate of a polyhydric compound selected from the group consisting of sugars and polyhydric alcohols.

10. The process of claim 1 in which the protein is hydrolyzed to 8-30% 11. An artificial chocolate flavor which comprises in asmaae 12. An artificial chocolate flavor which comprises in combination the base fiavor factor of claim 1, abitterness flavor factor and an astringent flavor factor.

13. The process of claim 1' in which the reaction between the partially hydrolyzed protein and the saccharide is carried out in the presence of an amino acid selected from the group consisting of alpha-amino-n-butyric acid, histidine, alanine, arginine, aspartic acid, glycine, glutanic acid, v'aline, phenylalanine, proline, lysine, isoleucine, leucine, threonine, tyresine, and tryptophane'.

14. A process for producing a chocolate base flavor factor from an egg product containing egg albumin and glucose which comprises hydrolyzing the egg albumin 840%, and reacting a substantially anhydrous mixture of said hydrolyzed egg albumin and said glucose at a temperature of" approximately 120-150 C. to develop the chocolate base flavor factor.

15. 'Iheproductofthe processof claim 1.

References Cited. in the fileot this patent UNITED STATES PATENTS 2,103,495 Ruckdeschel Dec. 28, 19371 2,364,008 Stuart Nov. 28, 1944' 2,414,299 Hall Jan. 14, 1947 2,590,646 Pettibone Mar. 25, 1952 FOREIGN PATENTS 107,3'67 Great Britain Mar. 18', 1918 OTHER' REFERENCES The Chemical Senses, by Moncrieff, Leonard Hill Limited, 17 Stratford Place W. 1, London, 1944, pp. 109, 110, 196 and 239.

The Chemistry and Technology of Food and Food.

Products," by Jacobs, second edition, Interscience Pub lishers, Inc., New York, 1951, page 1649. 

1. A PROCESS FOR PRODUCING A CHOCLOATE BASE FLAVOR FACTOR COMPRISING REACTING A PARTIALLY HYDROLYZED EGG ALBUMIN WITH A SACCHARIDE BY THE APPLICATION OF HEAT TO A MIXTURE OF THE REAGENTS AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO PRODUCE SAID BASE FLAVOR FACTOR IN A SUBSTANTIALLY ANHYDROUS CONDITION AT LEAST AT THE END OF THE REACTION, THE REACTION BEING CARRIED OUT AT A TEMPERATURE OF 90*-130*C. WHERE THE SACCHARIDE IS A PENTOSE; 120*-150EC. WHERE THE SACCHARIDE IS A NON-REDUCING GROUP OF HEXOSES AND REDUCING POLYSACCHARIDES; AND 140*-170*C. WHERE THE SACCHARIDE IS A MON-REDUCING POLYSACCHARIDE WHICH IS A PERCURSOR OF A REDUCING SACCHARIDE. 